Charles e



c. E. DAVIS DRIVING CHAIN FOR MINING MACHINES.

APPLICATION FILED MAY 10. I915- 1,808,843; Patented July 8, 1919.

" UNITED STATES PATENT OFFICE.

CHARLES E. DAVIS, OF CHICAGO, ILLINOIS, ASSIGNOR IO GOODMANMANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DRIVING-CHAIN FOR MINING-MACHINES.

e1,3os,s43.

Patented July 8, 1919.

' Application filed May 10, 1915. Serial No. 26.991.

To all whom it may concern? Be it known that I, CHARLES E. DAVIS, acitizen of the United States, residing at Chicago, in the county of Cookand State of Illinols, have invented a certain new and usefulImprovement in Driving-Chains for Mining-Machines, of which thefollowing is a specification.

My invention relates to improvements in cutter chains for mlningmachines, and has for its obj ect to provide a new and improved chain ofthis description.

The invention is illustrated in the accompanying drawings,'whereinFigure 1 is a plan view; 1

Fig. 2 is a longitudinal sectional view through one of the blocks,

Fig. 3 is a cross sectional view through one of the joints where theknife carrying blocks of the chain are connected together and showingthe chain in the guide;

Fig. 4 is an enlarged view of the eccentric pins used in connecting theblocks together;

I or lining for a mining machine chain made up of a series of blocks 1,which carry knives oreutters 2, the blocks being directly connectedtogether without intervening links. Each block is bifurcated at one end,having two separated branches 3. At the other end of each block is asingle piece 4, which is received be tween the branches 3 of theadjacent block.

Part 4 is provided with an opening lnto which is received a removablebushing 57 made of hardened steel, some means being provided forpreventin the bushing from turning in the block. preferably made of flatpieces of steel which are formed into proper shape and the two 'meetingends 6 are bent so as to project laterally,

said meeting ends fitting into a groove 7 in' the block and preventingthe bushing from turning in the block. When hese bushings areconstructedin this manner, the bushings are spring bushings and when placed inpositron spring outwardly so as to enga e the inner face of the openingin the bloc the bushings being thus held in place without the aid of anyholding device, before the blocks are assembled. The branches 3 areprovided with holes which are in alinement with thehole in the part 4 ofthe adjacent part so that. when the part 4 is inserted be- .tween thebranches 3 the connecting pin 8 of hardened steel may be inserted so asto hold the'blocks together. These pins pass through the hardened steelbushings 5 and rotate therein. Some means is provided for preventingthem from rotating in'the openings in the branches 3 so as to confinethe wear of the chain to the hardened steel bushings 5 and the hardenedsteel pins 8. As herein shown, this is accomplished by providing thepins 8 with enlarged eccentric heads 9 .which fit into eccentric holesor.

countersunk openings 10 in one of the branches 3. Some suitable means isprovided for holding these pins in place. In

view of the fact that the pins are of hardened steel they c'annotberiveted, and hence I have shown said pins as being provided with aremovable eccentric head 11, which fits into an eccentric opening 12 inone of the branches 3 of the block. The pin and removable head haveopenings passing thencthrough for a pin or rivet 13 of softer metal,which can have its ends riveted as illustrated in Fig. 3 to hold themtogether and thus keep the wearing pin in position. It will therefore beseen that by means of this construction'the blocks containing the knivesor cutters are directly connected together; and it will further be seenthat the wear on these blocks comes not upon the material of the blocksthemselves but upon the hardened removable bushings and pins which areable to stand the wear and which, if worn, can be easily, quickly andcheaply replaced, thereby preservmg the expensive knife holding blocksand insuring the long life of the chain. By doing away with the linksconnecting the blocks, the number of knives for a chain of any givenlength is greatly increased, and this greatly, reduces the wear' on thechain and increases its life, and the wear on the knives is alsoreduced.

The chain made up of these blocks and knives passes around the usualcutter arm 14: (see Fig. 3). In Fig. 3 T have also shown the blocks asprovided at the top and bottom with the projecting lips 15 at the shankof the knife'which should be of the.

proper size and shape. It has been found that the sand forming the coreburns away and the hole is too small and the metal has to be cut out.This is expensive and makes it difiicult to get a correct fit of theshank in the opening. If they hole is too small the shank cannot beplaced in it, and if too large it works loose and comes out. In thepresent construction this; difficulty is obviated by providing a casing19, of metal, such as sheet steel, the opening of which is just the sizeof the shank of the knife. This rectangular casing is placed around thecore of the mold in which the'block 'is molded,

- and when the hot metal is poured into the mold it comes into contactwith this metal casing and melts it sufficiently to adhere to it. Thenwhen the core of sand is removed from the casing this casing formsthe-inner lining for the opening for the shank.- This gives a smoothinner surface to this opening and provides an opening of exactly theright size at alltimes, and does away with the necessityof doing anymachine work on it. Thecasing is shown separate from the block in Fig. 7and is shown in the block in Figs. 1 and 2..

construction embodying the invention, but

I it is of course-evident that the parts may be varied in manyparticulars without departing from the spirit of my invention, and Itherefore do not limit myself to the par- "ticular construction'shown.

As shown-in Figs. 1 and 2,'the. space between'the branches3 of thebifurcated end of the block 1 is. greaterthan is necessary for the proecting end of theadjacent block, thereby leavin an openin 20 whichextends entirely t rough the b ock, The teeth 21 of the sprocket, wheel22, at the point where the chain changes direction (see Fig.

1) project into these openings 20, and it will be noted that since theopenings pass entirely through the chain when it 11S assembled, there isno chance for these open-v ings to become filled with foreign matter soas to interfere with the proper operation of as the teeth of the nsoaecesprocket wheel will push any such foreign matter out through the end ofthe opening opposite them, into which the tooth enters. The sprocketwheel drives the chain when the machine is-in operation, and when driv-'ing it in one direction the teeth of the sprocket wheel engage the ends23 of the blocks which project between the members 3. When the sprocketwheel moves the l 19 is also provided with. a shoulder 26 which fits theshoulder 25." 1

I claim:

1. i A chain for mining machines formed of links perforated near theiropposite ends, pins for uniting the links, and bushings with which thesaid pins engage seated in the perforations in one of the end'portionsof the piece of metal bent into cylindrical shape,

links, the bushings being each formed of a the ends of the metal of thebushing. being bent outwardly and brought close together andsubstantially parallel, the said ends being fitted into a groove formedin the link and communicating with the perforation in which the bushingis seated. i

2. A block forcutter chains for mining machines, comprising, a bodyportion having openings therethrough at opposite ends thereof, aremovable'bushing in the opening p I I at one end of the body portionand provided I have described in detail a particular with a projectinpart which fits into a groove'in the b0 y portion, a pin passingthrough. the opening at the other end of said body portion, said pinprovided withan e0 centric head theopening at the said other end beingen larged to receive said eccentric head, and means for fastening saidpin in position.

3. A block for cutter chains for miningmachines, comprising a bodyportion having openings therethrough at opposite ends thereof, aremovable bushing in the openingat one end of the body portion, meansfor preventing said bushing from rotating with relation to said bodyorti'on, a. member provided with an eccentric head, and with aprojecting part which projects into the opening at the other end of saidblock, said opening bein enlarged to receive said eccentric head, andposition. I

4. A block constituting one of the elemeans for holding said member inments of a chain for mining machines having one of its ends formed intoseparated branches and its opposite end shaped to fit between thebranches of a similar block, the block being perforated near itsopposite ends to receive the connecting parts that unite it with similarblocks, and one of the branches having formed in its outer face aneccentric recess, in combination with a pin adapted to pass through 7registering perforations of blocks that are to be united, the pin havingat one of its ends anveccentric head adapted to fit said recess .in theblock and hold the pin against relative rotation, a separate head forthe opposite end of the pin, and means for uniting the separate. head.to the pin.

5. A blockconstituting one of the elements of a chain for miningmachines having one of its ends formed into separated branches and itsopposite end shaped to fit between the branches of a similar block, theblock being perforated near its opposite ends to receive the connectingparts that unite it with similar blocks, and the branches having formedin their outer faces eccentric recesses, in combination with a pin ofhardened metal serving as a pintle for connected blocks having aneccentric head adapted to fit into one of the said eccentric recesses, a

separable head for the pin adapted to fit into the other eccentricrecess and a rivet of softer metal passing through the pin and unitingits separate headthereto and thus securing it in working position.

6. A block for cutter chains for mining machines, comprising a bodyportion having an opening therethrough at one end, a sleeve of hardenedmetal passing through said opening, means for preventing said sleevefrom rotating with relation to said body portion, the other end of saidbody portion having two separated branches adapted to receive betweenthem the adjacent part to which said block is connected, each of saidbranches having an opening, a in of hardened metal passing-throu h saidopenings, an enlarged eccentric hea connected with said pin, one end ofthe opening in the body portion being enlarged to receivesaid eccentrichead, and means for fasteningsaid pin and head to said body portion. v

In testimony whereof I affix my signature, I

inthe presence of two witnesses,-this 22nd day of April, 1915.

CHARLES E. DAVIS.

Witnesses:

MINNIE M. LINDENAU, ELLA THIEME.

